Update sphinxcontrib-serializinghtml from 1.1.1 to 1.1.3

requirements/docs.txt

@@ -69,9 +69,9 @@ requests==2.22.0 \
 sphinxcontrib-httpdomain==1.7.0 \
     --hash=sha256:1fb5375007d70bf180cdd1c79e741082be7aa2d37ba99efe561e1c2e3f38191e \
     --hash=sha256:ac40b4fba58c76b073b03931c7b8ead611066a6aebccafb34dc19694f4eb6335
-sphinxcontrib-serializinghtml==1.1.1 \
-    --hash=sha256:01d9b2617d7e8ddf7a00cae091f08f9fa4db587cc160b493141ee56710810932 \
-    --hash=sha256:392187ac558863b8aff0d76dc78e0731fed58f3b06e2b00e22995dcdb630f213
+sphinxcontrib-serializinghtml==1.1.3 \
+    --hash=sha256:c0efb33f8052c04fd7a26c0a07f1678e8512e0faec19f4aa8f2473a8b81d5227 \
+    --hash=sha256:db6615af393650bf1151a6cd39120c29abaf93cc60db8c48eb2dddbfdc3a9768
 sphinxcontrib-applehelp==1.0.1 \
     --hash=sha256:fb8dee85af95e5c30c91f10e7eb3c8967308518e0f7488a2828ef7bc191d0d5d \
     --hash=sha256:edaa0ab2b2bc74403149cb0209d6775c96de797dfd5b5e2a71981309efab3897